Events // Department of Physics // University of Notre Dame

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Mon Sep 25, 2017

Special Colloquium: Prof. Lisa Randall, Harvard University

4:00 PM - 5:00 PM
123 Nieuwland Science Hall

The Nature of Dark Matter

Dr. Lisa Randall
Frank B. Baird, Jr., Professor of Science
Harvard University

I will discuss possibilities for dark matter, focusing on my recent work on how astronomical measurements can give insights into dark matter’s interactions.

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Posted In: Colloquia and Special Lectures and Events

A Conversation with Lisa Randall -- public lecture

7:00 PM - 8:00 PM
Washington Hall

Randall 2017 Poster

A renowned scientist and author, Professor Lisa Randall studies theoretical particle physics and cosmology at Harvard University. Her research connects theoretical insights to puzzles in our current understanding of the properties and interactions of matter, as well as exploring ways to experimentally test these ideas at the Large Hadron Collider and elsewhere. …

Posted In: Special Lectures and Events

Tue Sep 26, 2017

Astrophysics Seminar: Dr. Emma Fernandez-Alvar, UNAM

12:30 PM - 1:30 PM
184 Nieuwland Science Hall

The Characterization of the Galactic Stellar Halo as Seen by SDSS

Dr. Emma Fernandez-Alvar
Postdoc, UNAM

During the last decades, the detection of spatial, chemical and kinematical inhomogeneities in the Galactic halo favors a formation scenario in line with the current Lambda-Cold Dark Matter cosmological model. However, the formation processes are still far from being well described. I will talk about the analysis of chemical abundance trends in halo stars from low- and high-resolution stellar spectra from the Sloan Digital Sky Survey. In particular, I will describe the analyses performed over two halo stellar sub-populations detected in APOGEE data (an SDSS sub-program), previously revealed in the work of Nissen & Schuster (2010), and following papers, from which we infer characteristics of the initial mass function (IMF) and star formation history (SFH) from simple chemical evolution models for each of these two sub-populations. From this study we obtain an earlier, more intense, and longer SFH, and a top-heavier IMF for the sub-population with higher alpha-to-iron ratios.